Dear All:

This is what I do. :)

First, make sure you read the doc. http://curl.haxx.se/docs/httpscripting.html

1: install a packet sniffer, you can use wireshark on linux, and httplook on
windows. (Although there is also the win32 version of wireshark, it is an
overkill for a simple purpose of sniffing http packets only)

2: turn on the packet sniffer. (for wireshark you need to also set up filter)
Do a upload from the browser/application that works, and also the script that
you are debugging. Simplify the problem down to a single curl command. Save
the sniffed packet data respectively. I use follow tcp stream in wireshark
then save. I think httplook has a even simpler interface.

3: check the packet file, make sure all the field is included in your curl
command. Also check cookies and user agent, a lot of problems come from
missing cookies or incorrect user agents.

4: if it still doesn't work, try to imitate the headers from the
browser/application that works completely in your curl command. Sometimes the
web server does whacky things and reject perfectly fine http request.

5: ...Profit!...

Happy coding!

Thanks
Wei

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Received on 2008-09-17